In retrospect, I don’t think we actually cleared stated the situation in the turn recap. It wasn’t a matter of the unit ending up in ruins, but the first model placed (center of the circle) actually wound up inside a wall so could not be placed even using wobbly model syndrome rules.

Hmm, I understand the ruling but it basically means that building walls are impassable terrain to deep strikers which I don’t think is the intended result. That would definitely be a “Call the judge and get ready to argue” kind of call if my opponent said that. Since you can’t technically place a plague drone on the first floor of ANY(with less than a 6′ ceiling) building it seems odd to declare the wall is any different.